JP2013250016A - Fin tube heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fin tube heat exchanger having improved drainability and superior thermal performance.SOLUTION: A fin tube heat exchanger includes: a plurality of facing flat tubes 1; a corrugate fin 2 that is arranged between the flat tubes 1, is connected to the flat tubes 1, and where a top part 121 and an intermediate part 122 are formed in a wave form so that they are alternately repeatedly and airflow 80 passes between gaps; and a rise portion 101 that is formed on a surface of the corrugate fin 2, and has two rising sides 101b. The intermediate part 122 is formed to incline in a horizontal direction. The rising sides 101b are formed in parallel with the tilted direction, and water accumulation to the rising sides 101b of the rise portion 101 is suppressed, improving drainability. Accordingly, thermal performance can be improved.

Description

  The present invention particularly relates to a finned tube heat exchanger used for heat exchange between a refrigerant and air.

  Conventionally, as shown in FIG. 12, this type of heat exchanger has a plurality of flat tubes 1 arranged in parallel with each other at a predetermined pitch with the longitudinal direction being substantially parallel to the vertical direction, and these flat tubes 1. A horizontal upper header 10 that connects the upper ends of the flat tubes 1 and a horizontal lower header 11 that connects the lower ends of the flat tubes 1 are provided.

  Further, between the adjacent flat tubes 1, a corrugated fin 2 is provided in which a joint portion with the flat tube 1 is bonded by brazing or bonding, and is bent into a wave shape, and the airflow 80 passes through the gap. Has been.

  Further, as this type of heat exchanger, as shown in FIG. 13, a plurality of cut-and-raised portions 7 raised from the surface of the corrugated fin 2 by two rising edges 7b are provided on the surface of the corrugated fin 2 (for example, , See Patent Document 1).

  In the heat exchanger described in Patent Document 1, as shown in FIG. 13, the leading edge 7 a that connects the rising edges 7 b of the cut and raised 7 provided on the surface of the corrugated fin 2 is non-perpendicular to the air flow 80. It is formed so as to be inclined. The rising side 7 b is formed so as to be inclined or parallel to the air flow 80.

  As described above, in the heat exchanger described in Patent Document 1, the front edge portion 7a is formed so as to be inclined with respect to the air flow 80, so that the front edge portion 7a is arranged from the windward side to the leeward side. It becomes. Thereby, the temperature boundary layer which grows toward the downstream side of the corrugated fin 2 can be divided, and the boundary layer leading edge effect can be increased to improve the heat transfer performance.

  Moreover, since the front edge part 7a is arrange | positioned diagonally with respect to airflow, it will be in the state from which the temperature distribution of airflow exists from the windward side of the front edge part 7a to the leeward. Therefore, even when the temperature of the corrugated fin 2 is less than 0 ° C., frost formation on the front edge portion 7a is suppressed and clogging of the cut and raised portion 7 is suppressed, so that heat transfer performance can be improved.

JP-A-62-172193

  However, in the conventional configuration, the rising edge 7b is formed parallel to or inclined with respect to the air flow 80. Therefore, as shown in FIG. It had the subject of staying in 7b, causing an increase in ventilation resistance and lowering the heat transfer performance.

The present invention solves the above-mentioned conventional problems. The rising edge of the cut and raised formed on the corrugated fin has a shape that allows the water adhering to the corrugated fin to smoothly flow down, thereby improving drainage and transferring power. It aims at providing the finned-tube heat exchanger excellent in thermal performance.

  In order to solve the conventional problems, a heat exchanger according to the present invention is arranged between a plurality of opposed flat tubes and the flat tubes, joined to the flat tubes, and a top portion and an intermediate portion are alternately repeated. And a corrugated fin through which airflow passes through the gap, and a cut and raised portion formed on the surface of the corrugated fin and having two rising edges, and the intermediate portion is And the rising edge is formed in parallel with the inclination direction.

  Thereby, it is possible to suppress the water generated in the corrugated fins from staying on the rising side, and to allow the water to flow down along the inclination of the corrugated fins, thereby improving drainage as a heat exchanger. Can do.

  According to the present invention, it is possible to provide a finned tube heat exchanger with improved drainage and excellent heat transfer performance.

Front principal part enlarged view of the finned-tube heat exchanger in Embodiment 1 of this invention (A) Main part enlarged perspective view of the fin tube heat exchanger (b) Main part enlarged perspective view showing another cut-and-raised arrangement of the fin tube heat exchanger (c) Still other parts of the fin tube heat exchanger The principal part expansion perspective view which shows arrangement | positioning of the raising and raising of (A) The principal part expansion perspective view which arranged the raising and lowering of the fin tube heat exchanger in the leeward side (b) The principal part expansion perspective view which provided the undulation part in the windward side of the fin tube heat exchanger The principal part expansion perspective view of the finned-tube heat exchanger in Embodiment 2 of this invention Image of the drainage action of water in the finned tube heat exchanger The principal part expansion perspective view which made the fluid path the recessed part in the same finned-tube heat exchanger The principal part expansion perspective view which made the fluid path a small hole in the fin tube heat exchanger The principal part expansion perspective view which provided the recessed part which bypasses a fluid path | route in the same finned-tube heat exchanger (A) The principal part expansion perspective view of the fin tube heat exchanger in Embodiment 3 of this invention (b) The principal part expansion perspective view which formed the fluid path of the other shape in the fin of the fin tube heat exchanger (A) The principal part expansion perspective view which formed the square-shaped small hole in the fin of the fin tube heat exchanger (b) The principal part enlarged perspective view which formed the triangular hole in the fin of the fin tube heat exchanger The principal part expansion perspective view of the finned-tube heat exchanger in Embodiment 4 of this invention A perspective view of a conventional finned tube heat exchanger The principal part expansion perspective view of the conventional fin tube heat exchanger Front main part enlarged view showing a moisture retention site of a conventional finned tube heat exchanger

  A first invention is provided between a plurality of opposed flat tubes and the flat tubes, is joined to the flat tubes, and is formed in a wave shape so that a top portion and an intermediate portion are alternately repeated. A corrugated fin through which airflow passes, and a cut and raised portion formed on the surface of the corrugated fin and having two rising edges, and the intermediate portion is formed to be inclined with respect to a horizontal direction, and The finned tube heat exchanger is characterized in that a rising side is formed in parallel to the inclined direction.

  As a result, the water adhering to the rising edge of the cut and rise flows down along the intermediate portion inclined with respect to the horizontal direction, and is further guided to the cut and raised opening by the kinetic energy of the airflow, Therefore, the drainage of the heat exchanger can be improved and the heat transfer performance can be improved.

  A second invention is characterized in that, in the first invention, in particular, a fluid path is provided on the corrugated fin and between the junction between the flat tube and the corrugated fin and the cut and raised. A finned tube heat exchanger.

  Thereby, in particular, the water staying at the junction between the corrugated fin and the flat is guided down vertically along the fluid path, so that the drainage of the heat exchanger is improved and the heat transfer performance is improved. Can be improved.

  According to a third aspect of the invention, in the first or second aspect of the invention, a refrigerant containing at least one of an HFC refrigerant, an HFO refrigerant, an HC refrigerant, and a CO2 refrigerant is used as the refrigerant that circulates in the flat tube. It is the fin tube heat exchanger characterized.

  Thereby, destruction of the ozone layer is reduced, and since the HC refrigerant or the CO2 refrigerant has a low global warming potential, it is possible to provide products such as an air conditioner and a refrigerator that are environmentally friendly. Moreover, since the usage-amount of these refrigerant | coolants can be decreased by using a flat tube, the energy saving property as a heat exchanger can further be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
As shown in FIG. 12, the basic configuration of the heat exchanger in the present embodiment is a plurality of flat tubes 1 arranged in parallel with each other at a predetermined pitch with the longitudinal direction being substantially vertical, and adjacent flat tubes. 1 is provided between the flat tube 1 and the corrugated fins 2 that are bent or formed into a wave shape and through which the airflow 80 passes. The corrugated fins 2 and the flat tubes 1 are joined by brazing or bonding.

  FIG. 1 is an enlarged view of the main part of the front side of the finned-tube heat exchanger according to Embodiment 1 of the present invention, and FIGS. FIG.

  As shown in FIG. 1, the corrugated fin 2 is formed into a wave shape so that the top portion 121 and the intermediate portion 122 are alternately repeated, and is joined to the flat tube 1 at the joint portion 102.

  Here, the top part 121 is formed in a round shape having a certain curvature, and the intermediate part 122 is formed so as to be inclined at a predetermined angle with respect to the horizontal direction. Thereby, moisture deposited on the surface of the corrugated fin 2 can be guided toward the flat tube 1 along the intermediate portion 122. In addition, the shape of the top part 121 is not specifically limited, For example, the top part 121 may be formed flat.

  Further, the inclination angle of the intermediate portion 122 is not particularly limited as long as the inclination does not hinder the flow of moisture.

As shown in FIGS. 1 and 2, one or more cut and raised portions 101 are provided in the intermediate portion 122 of the corrugated fin 2. The cut-and-raised portion 101 is formed so as to be inclined so that the front edge portion 101 a is not perpendicular to the airflow direction, and the rising side 101 b connected from the surface of the corrugated fin 2 is formed parallel to the inclined direction of the intermediate portion 122. The That is, the surface of the rising edge 101 b is formed in a direction parallel to the direction in which moisture such as condensed water generated on the surface of the corrugated fin 2 flows along the surface of the corrugated fin 2.

  Further, the cut-and-raised surface 101 c vertically above the cut-and-raised 101 is provided in parallel with the surface of the intermediate portion 122 of the corrugated fin 2.

  The operation of the heat exchanger having the above configuration will be described.

  In the heat exchanger of the present embodiment, heat exchange is performed between the airflow 80 flowing through the gap between the corrugated fins 2 and the heat medium flowing through the flat tube 1 via the corrugated fins 2 and the flat tube 1. .

  At this time, since the front edge portion 101 a of the cut and raised 101 is inclined with respect to the air flow 80, the temperature boundary layer of the air flow 80 generated on the surface of the corrugated fin 2 can be divided by the cut and raised 101. Further, the total length of the front edge portion 101a can be increased as compared with the case where the front edge portion 101a is perpendicular to the direction of the airflow 80.

  Thereby, the boundary layer leading edge effect can be increased and the heat transfer performance can be improved.

  In addition, when the heat exchanger of the present invention is mounted on an indoor unit or an outdoor unit of an air conditioner and operated as an evaporator, the surface temperature of the flat tube 1 and the corrugated fin 2 is lower than the ambient temperature. Thus, moisture in the air adheres to the surfaces of the flat tube 1 and the corrugated fin 2 as condensed water.

  Further, in the outdoor unit, when the outside air temperature is less than 0 ° C., frost is formed on the surface of the corrugated fin 2, and therefore, a defrosting operation is performed at regular intervals. Molten water after melting melts.

  Water such as condensed water and molten water flows along the surface of the corrugated fin 2. Here, since the rising edge 101b is formed in parallel with the inclination direction of the intermediate portion 122, the moisture adhering to the rising edge 101b is induced by the inclination and flows downward in the inclination direction.

  Further, water such as condensed water and molten water adhering to the corrugated fin 2 forms a water film at the opening between the cut and raised surface 101c and the surface of the corrugated fin 2 by the action of the surface tension of the water. The ventilation resistance of the fin 2 is increased.

  However, the cut and raised 101 is arranged so that the front edge portion 101a is inclined with respect to the airflow direction. Therefore, the kinetic energy of the airflow 80 moves the water film smoothly along the front edge portion 101 a, and as a result, moisture is guided to the rising edge 101 b on the downstream side with respect to the airflow 80.

  Here, the rising edge 101b is arranged in parallel to the inclination direction of the intermediate portion 122, that is, parallel to the direction in which the condensed water generated on the surface of the corrugated fin 2 flows. The unevenly distributed moisture can smoothly flow down along the slope, and the retention of moisture on the rising edge 101b can be suppressed.

Thus, the drainage property of the water | moisture content adhering to the corrugated fin 2 can be improved, and heat-transfer performance can be improved.

  In addition, the inclination direction with respect to the airflow 80 of the front edge part 101a is as shown in FIG.2 (b), the thing of the inclination direction opposite to FIG.2 (a), or an airflow as shown in FIG.2 (c). The inclination direction with respect to 80 may be mixed. At this time, if the rising edge 101b is arranged in parallel to the direction in which the moisture on the corrugated fins 2 flows, that is, the inclination direction of the intermediate portion 122, drainage can be improved.

  Note that one of the rising edges 101b shown in FIG. 2A is arranged vertically upward with respect to the inclination direction of the intermediate portion 122, and the other is vertically downward, and with respect to the inclination direction of the intermediate portion 122. The upper rising edge 101b is disposed on the upstream side of the airflow 80. As a result, moisture can be induced using the three elements of the inclination of the intermediate portion 122, the inclination of the front edge portion 101 a with respect to the airflow 80, and the kinetic energy of the airflow 80.

  Therefore, the water film formed in the cut and raised 101 and the water staying in the rising edge 101b can be smoothly guided and flowed down, and the drainage effect of the heat exchanger can be further improved.

  In addition, as shown to Fig.3 (a), aiming at equalization of the heat exchange distribution from the upstream of the corrugated fin 2 to the downstream by arrange | positioning the raising and lowering 101 only to the airflow 80 downstream of the corrugated fin 2. FIG. Can do. Therefore, when a heat exchanger is used under conditions where frost formation occurs, frost formation on the corrugated fins 2 is made uniform, and an increase in ventilation resistance due to uneven frost formation is suppressed, thereby suppressing a decrease in heat transfer performance. Can be achieved.

  In addition, as shown in FIG.3 (b), the structure which provided the uneven | corrugated | grooved part 201 in which a peak part and a trough part are formed in order with the airflow 80 in the upstream of the airflow 80 as a heat-transfer promotion part was provided. Therefore, frost formation can be made uniform, and the heat transfer performance can be further improved by the effect of promoting turbulence by the undulating portion 201.

(Embodiment 2)
FIG. 4 is an enlarged perspective view of a main part of the finned tube heat exchanger according to Embodiment 2 of the present invention. Note that in this embodiment, the same portions as those in the other embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the heat exchanger according to the present embodiment includes a corrugate as a fluid path for drainage on the surface of the corrugated fin 2 and in a region between the cut and raised 101 and the flat tube 1. A notch 103 that communicates the front and back of the fin 2 is provided.

  A plurality of the cuts 103 are arranged in parallel with the airflow direction, and a part of the cut vertical upper ends 103a are in contact with the ends of the rising edges 101b.

  About the heat exchanger of the above structure, the operation | movement is demonstrated using FIG. In FIG. 5, the description of the cut and raised 101 is omitted for the sake of explanation.

  When this heat exchanger is used as an evaporator, as shown in FIG. 5, moisture 20 such as condensed water and condensed water generated in the flat tubes 1 and the corrugated fins 2 is affected by gravity, and finally In this case, the resistance of the airflow 80 staying at the junction 102 between the surface of the corrugated fin 2 and the flat tube 1 and passing through the gap between the corrugated fins 2 is increased, and the heat transfer performance is lowered.

However, since the notches 103 are provided on the surface of the corrugated fins 2 in the vicinity of the joints 102 as in the present embodiment, the moisture remaining in the joints 102 is caused by capillarity and gravity drop in the notches 103. Under the influence, the corrugated fin 2 is guided to the back side and smoothly flows down, and the drainage can be improved. Therefore, increase in ventilation resistance can be suppressed and heat transfer performance can be improved.

  Further, by forming the ends of some of the cuts 103 in contact with a part of the rising side 101b of the cut and raised 101, the water flowing down from the cut and raised 101 is smoothly guided to the cut 103 and flows down. .

  Therefore, it is possible to further improve the drainage of the moisture adhering to the cut and raised 101, to suppress an increase in ventilation resistance of the cut and raised 101, and to improve the heat transfer performance.

  In the present embodiment, the notch 103 is provided in a region vertically above the joint 102, but in addition, in the cut and raised 101 vertically below the joint 102, that is, in the corrugated fin 2, May be provided between the cut-and-raised portion 101 formed in the lower region and the joint portion 102.

  Thus, the notch 103 is formed in the vicinity of the top 121 so as to oppose the junction 102 as a boundary. Therefore, the moisture staying on the upper surface of the joint portion 102 flows down vertically through the cuts 103 while alternately passing through the front and back of the corrugated fins at the top 121 of each layer.

  Therefore, a fluid flow path in which moisture smoothly flows down is formed in the heat exchanger, and the drainage can be further improved.

  In this way, moisture can be induced by the incision 103 that is easy to process, and by using the capillary phenomenon, moisture can be guided to the back side of the corrugated fin 2 to smoothly flow down. The heat transfer performance can be improved while suppressing the increase in ventilation resistance and maintaining the heat transfer area.

  Note that the fluid path for drainage may be a recess 104 as shown in FIG. 6 or a small hole 106 as shown in FIG.

  Here, in FIG. 6 and FIG. 7, a plurality of the concave portions 104 and the small holes 106 are arranged in parallel with the airflow direction. In addition, the recess 104 and the small hole 106 are partially formed in contact with the cut and raised 101 and toward the joint 102.

  In addition, the recessed part 104 is continuously formed over both the vertically upward direction and the vertically downward direction with the joint part 102 as a boundary. In other words, the corrugated fins 2 are formed continuously from a predetermined level toward the adjacent lower level.

  In this way, by making the fluid path into a concave shape and a small hole shape, moisture can flow smoothly while maintaining the rigidity of the corrugated fin 2, so that drainage is improved and ventilation resistance is increased. It can suppress and can improve heat transfer performance.

  In addition, by forming the recess 104 and the small hole 106 to dimensions that cause capillary action, moisture can flow more smoothly.

When the fluid path has a concave shape, the heat transfer performance of the corrugated fin 2 is improved by promoting the turbulent flow of gas while maintaining the heat transfer path of the solid heat conduction of the corrugated fin 2. Can do.

  Further, as shown in FIG. 8, the drainage of the condensed water remaining between the recesses 104 can be further improved by bypass-connecting the recesses 104 with an arc-shaped recess 105. In addition, if the circular arc-shaped recessed part 105 is formed so that the both end points may become a vertically downward side, it will become the structure from which a water | moisture content flows easily into the recessed part 104, and can improve drainage more.

  In FIG. 8, the concave portion 105 has an arc shape, but may have a wedge shape, for example. Further, the recess 105 is not only formed between the recesses 104, but may be disposed between other shapes of fluid paths such as the notch 103 shown in FIG. 4 and the small hole 106 shown in FIG.

(Embodiment 3)
FIGS. 9A and 9D are enlarged perspective views of main parts of the heat exchanger according to Embodiment 3 of the present invention. In this embodiment, parts that are the same as in the other embodiments are given the same reference numerals, and detailed descriptions thereof are omitted.

  In the heat exchanger according to the present embodiment, as shown in FIG. 9A, a fluid path for drainage is provided on the rising edge 101b on the lower side in the inclination direction of the intermediate portion 122, out of the two rising edges 101b. The notch 107 and the small hole 108 as shown in FIG.9 (b) are provided.

  The notch 107 and the small hole 108 are guided so that moisture such as condensed water staying on the rising side 101b on the lower side in the inclination direction of the intermediate portion 122 flows down to the back side of the corrugated fin 2 before flowing into the joint portion 102. To do. Thereby, drainage can be improved, the increase in ventilation resistance can be suppressed, and heat transfer performance can be improved.

  Further, the notch 107 and the small hole 108 occupy a small area with respect to the surface area of the corrugated fin 2. Therefore, it is possible to smoothly flow moisture using the capillary phenomenon while maintaining the heat transfer of the corrugated fins 2.

  The shape of the small hole 108 is not particularly limited. For example, in addition to the circular shape as shown in FIG. 9B, a rectangular shape as shown in FIG. 10A, as shown in FIG. It may be a triangular shape.

  Further, by providing a fluid path around the cut and raised 101, the fluid path can be processed simultaneously with the processing of the cut and raised 101, and a finned tube heat exchanger with improved heat transfer performance can be obtained without increasing the number of processing steps. Can be provided.

(Embodiment 4)
FIG. 11 is an enlarged perspective view of a main part of the finned tube heat exchanger according to Embodiment 4 of the present invention. Note that in this embodiment, the same portions as those in the other embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 11, the heat exchanger in the present embodiment extends in the longitudinal direction of the flat tube 1, that is, in a substantially vertical direction, as a fluid path for drainage, on the flat portion of the flat tube 1, and has a width of 0. A plurality of concave stripes 110 of 7 mm or more and 2 mm or less are provided at predetermined intervals in the long axis direction of the flat tube 1.

  Further, a plurality of groove portions 111 that are connected to the concave stripe 110, have an inclination angle of 30 ° or less with respect to the horizontal direction, and have a width of 0.7 mm or less are provided.

  About the heat exchanger comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In the present embodiment, as a fluid path for drainage on the flat portion of the flat tube 1, the longitudinal direction of the flat tube 1, that is, the substantially vertical direction, and a groove 110 having a width of 0.7 mm or more and 2 mm or less, A plurality of grooves 111 having a width of 0.7 mm or less, which are connected to the recess 110 and are inclined at a predetermined angle with respect to the horizontal direction, are provided.

  As a result, the water deposited on the surface of the flat tube 1 and the water staying on the joint 102 of the corrugated fin 2 are guided and flowed down by the groove 110 and the groove 111, so that the drainage is improved and the transmission is improved. Thermal performance can be improved.

  In addition, since the width | variety of the groove 110 and the groove | channel 110 is both set to the dimension which a capillary phenomenon acts, since the water | moisture content induced | guided | derived by the groove part 111 joins in the groove 110, the width | variety of the groove 110 Is larger than the width of the groove 111.

  In addition, as a refrigerant | coolant which distribute | circulates the inside of the flat pipe 1, at least 1 of HFC refrigerant | coolant, HFO refrigerant | coolant, HC refrigerant | coolant, CO2 refrigerant | coolant, or those mixed refrigerant | coolants is used, and also by utilizing a flat pipe | tube, The amount used can be reduced.

  Thereby, there is no destruction of the ozone layer, and since the HC refrigerant or the CO2 refrigerant has a small global warming potential, it is possible to realize an air conditioner or refrigerator considering the global environment.

  Note that the heat transfer promotion unit and the fluid path described in Embodiments 1 to 3 may be used in combination.

  As described above, the finned tube heat exchanger according to the present invention forms the rising edge of the cut and raised in parallel with the inclination direction of the corrugated fin intermediate portion, thereby improving the drainage performance. It can be applied to a heat exchanger used in a heating device or the like.

DESCRIPTION OF SYMBOLS 1 Flat tube 2 Corrugated fin 80 Airflow 101 Cut and raised 102 Joining part 101a Front edge part 101b Standing side 103,107 Cutting (fluid path)
104, 105 Concavity (fluid path)
106, 108 Small hole (fluid path)
110 Concave (fluid path)
111 Groove (fluid path)
121 Top 122 Middle

Claims (3)

A corrugate which is arranged between a plurality of opposed flat tubes and between the flat tubes, is joined to the flat tubes, is formed in a wave shape so that the top portion and the intermediate portion are alternately repeated, and the airflow passes through the gap A fin and a corrugated fin formed on a surface of the corrugated fin, the intermediate portion is formed so as to be inclined with respect to a horizontal direction, and the rising edge is inclined; A finned-tube heat exchanger characterized by being formed parallel to a direction. 2. The finned tube heat exchanger according to claim 1, wherein a fluid path is provided on the corrugated fin and between the joint portion of the flat tube and the corrugated fin and the cut and raised portion. The finned tube heat exchanger according to claim 1 or 2, wherein a refrigerant containing at least one of an HFC refrigerant, an HFO refrigerant, an HC refrigerant, and a CO2 refrigerant is used as a refrigerant that circulates in the flat tube. .